Thank you for the explanation ,
m
I think that you got this in mid virus definitions updates.
I saw this coming a mile off when I received a suspect email in my anti-spam software about a change of facebook password and attached file. I knew for a fact this was malware as a) I don't have a facebook account and b) there would be no way it would be notified in this way and attaching an .exe file inside a .zip attachment. So I allowed it through to so I could check.
I unpacked it from the .zip file and no alert from avast and uploaded it to virus total where 22/42 detected it as malicious. So I sent the file to avast from the chest reporting the problem VT detections, but no on system detection. Having started a manual update to ensure the file was submitted and shortly after that avast alerted to the file.
What the h*ll would you want to execute this file for, when it is so obviously dodgy
Never click links or open attachments or run the files in attachments in unsolicited emails, your system will tank you for it.
So this time you got very lucky in that avast detected it when you tried to run it, what would have happened if avast didn't detect this variant (almost anything) ?